Fix logd's implicit dependency on libsysutils.

We're trying to remove the implicit dependency on libsysutils that *all*
code has via the symlink in system/core/include/, but netd and logd have
code that #includes the headers without declaring the dependency (which
works out in the end because their executables declare the dependency).

Bug: http://b/165825252
Test: treehugger
Change-Id: I8c582e427d9dbe7d9f8172c445f38ae2737a9049